Astronomy and Astrophysics, volume 366, 178-196 (2001/1-4)
δ Scuti and related stars: Analysis of the R00 Catalogue.
RODRIGUEZ E. and BREGER M.
Abstract (from CDS):
We present a comprehensive analysis of the properties of the pulsating δ Scuti and related variables based mainly on the content of the recently published catalogue by Rodriguez et al. (2000A&AS..144..469R
, hereafter R00). In particular, the primary observational properties such as visual amplitude, period and visual magnitude and the contributions from the Hipparcos, OGLE and MACHO long-term monitoring projects are examined. The membership of these variables in open clusters and multiple systems is also analyzed, with special attention given to the δ Scuti pulsators situated in eclipsing binary systems. The location of the δ Scuti variables in the H-R diagram is discussed on the basis of HIPPARCOS parallaxes and uvbyβ photometry. New borders of the classical instability are presented. In particular, the properties of the δ Scuti pulsators with nonsolar surface abundances (SX Phe, λ Boo, ρ Pup, δ Del and classical Am stars subgroups) are examined. The Hipparcos parallaxes show that the available photometric uvbyβ absolute magnitude calibrations by Crawford can be applied correctly to δ Scuti variables rotating faster than vsini∼100km/s with normal spectra. It is shown that systematic deviations exist for the photometrically determined absolute magnitudes, which correlate with vsini and δm1
. The photometric calibrations are found to fit the λ Boo stars, but should not be used for the group of evolved metallic-line A stars. The related γ Dor variables and the pre-main-sequence δ Scuti variables are also discussed. Finally, the variables catalogued with periods longer than 0.25d are examined on a star-by-star basis in order to assign them to the proper δ Scuti, RR Lyrae or γ Dor class. A search for massive, long-period δ Scuti stars similar to the triple-mode variable AC And is also carried out.
stars: variables: δ Scuti - stars: oscillations - stars: fundamental parameters
Table 9: PL 43 not identified
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